http://www.bareefers.org/forum/index.php?threads/calcium-reactor-advice.12613/#post-189934
some names in that thread look VERY familiar to ones in this one
We're just getting older and forget what we wrote last time.
The 'pimp my regulator' thread is really perfect. (reposting BAYMACs link)
http://www.bareefers.org/forum/index.php?threads/pimp-my-regulator.12295/#post-198422
Hard to beat a medical grade dual stage regulator. They used to be found for reasonable prices on ebay. Since the planted tank folks found this source, the bidding can be fierce! The process does require a bit of DIY skills or there are locals that will build out a 'won' regulator for reasonable.
Since these devices can be temperamental it's important to have independent control or monitoring.